One of the most basic guitar skills are strumming up and down freely. What exactly is the difference between the two strokes (Up and Down)?
In general, apart from the fact that the pick goes in different directions, upstrokes are "lighter". You hear the high notes first and they are hit the hardest, which tends to dominate the sound. Downstrokes are more "closed", and the lower notes tend to dominate the sound as they are hit the hardest.

In this lesson we gonna focus on downstrokes. Playing downpicking will place more emphasis on the bass notes and provide a good background rhythm while accompanying another player or recording a song.